Temporal: Add test case for rounding up to a non-24-hour ZonedDateTime

test/intl402/Temporal/Duration/prototype/round/adjust-rounded-duration-days.js

@@ -0,0 +1,71 @@
+// Copyright (C) 2024 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-temporal.duration.prototype.round
+description: >
+  Test that a single day is added when rounding relative to a ZonedDateTime
+  with a non-24-hour day length.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+// Based on a test case by Adam Shaw
+
+var d = new Temporal.Duration(0, 0, 0, 0, 13, 0, 0, 0, 0, 0);
+var zdt = Temporal.ZonedDateTime.from('2024-03-10T00:00:00[America/New_York]'); // a 23-hour day
+
+// Rounding 13 hours up to next 12-hour increment gives 24,
+// except since `zdt` is 23 hours, an extra day needs to be added
+TemporalHelpers.assertDuration(d.round({
+  relativeTo: zdt,
+  largestUnit: 'years',
+  smallestUnit: 'hours',
+  roundingIncrement: 12,
+  roundingMode: 'ceil'
+}), 0, 0, 0, 1, 12, 0, 0, 0, 0, 0);
+
+// If smallestUnit is 'days' instead of 'hours', rounds up to just 1 day
+TemporalHelpers.assertDuration(d.round({
+  relativeTo: zdt,
+  largestUnit: 'years',
+  smallestUnit: 'days',
+  roundingIncrement: 1,
+  roundingMode: 'ceil'
+}), 0, 0, 0, 1, 0, 0, 0, 0, 0, 0);
+
+zdt = Temporal.ZonedDateTime.from('2024-11-03T00:00:00[America/New_York]'); // a 25-hour day
+d = new Temporal.Duration(0, 0, 0, 0, 25, 0, 0, 0, 0, 0);
+
+// With a 25-hour day and 25-hour duration, rounding up gives exactly 1 day
+TemporalHelpers.assertDuration(d.round({
+  relativeTo: zdt,
+  largestUnit: 'years',
+  smallestUnit: 'hours',
+  roundingIncrement: 12,
+  roundingMode: 'ceil'
+}), 0, 0, 0, 1, 0, 0, 0, 0, 0, 0);
+
+d = new Temporal.Duration(0, 0, 0, 0, 24, 0, 0, 0, 0, 0);
+
+// With a 24-hour duration, rounding up gives 24 hours
+// (not 1 day, as that would be 25 hours)
+TemporalHelpers.assertDuration(d.round({
+  relativeTo: zdt,
+  largestUnit: 'years',
+  smallestUnit: 'hours',
+  roundingIncrement: 12,
+  roundingMode: 'ceil'
+}), 0, 0, 0, 0, 24, 0, 0, 0, 0, 0);
+
+d = new Temporal.Duration(0, 0, 0, 1, 0, 0, 0, 0, 0, 0);
+
+// With a 25-hour day and 1-day duration, rounding up in hours
+// rounds from 25 to 36
+TemporalHelpers.assertDuration(d.round({
+  relativeTo: zdt,
+  largestUnit: 'hours',
+  smallestUnit: 'hours',
+  roundingIncrement: 12,
+  roundingMode: 'ceil'
+}), 0, 0, 0, 0, 36, 0, 0, 0, 0, 0);
+